Shawn Mendes and Billie Eilish fans surely are happier than ever hearing this cover.

Mendes dropped by BBC Radio 1 Live Lounge for Live Lounge Month, delivering a must-see cover of Eilish’s song “Happier Than Ever”. His performance follows girlfriend Camila Cabello’s recent cover of “Good 4 U” by Olivia Rodrigo.

RELATED: Billie Eilish’s Complicated Relationship With Social Media

Mendes kicked off the song with an acoustic guitar, before swapping in an electric guitar partway through the performance. He later took to Twitter and thanked both Eilish and BBC Radio 1.

“Happier Than Ever” is the titular track from Eilish’s sophomore studio album. It served as the chart-topping album’s sixth single.

RELATED: Billie Eilish Has Had ‘Six Dreams This Week’ About Getting Back On Tour

Mendes released his fourth-consecutive album that topped the charts, Wonder, on Dec. 4.

He released two non-album singles this year: “Kesi (Remix)” with Camilo and “Summer of Love” with Tainy.